/*
- * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
*
* \return If \a b < \a a, this function returns -1, otherwise it returns 1.
*/
-int tv_diff(const struct timeval *b, const struct timeval *a, struct timeval *diff)
+int tv_diff(const struct timeval *b, const struct timeval *a,
+ struct timeval *diff)
{
int ret = 1;
* \param sum Contains the sum \a a + \a b on return.
*/
void tv_add(const struct timeval *a, const struct timeval *b,
- struct timeval *sum)
+ struct timeval *sum)
{
sum->tv_sec = a->tv_sec + b->tv_sec;
if (a->tv_usec + b->tv_usec >= 1000 * 1000) {
* \param result Contains \a mult * \a tv on return.
*/
void tv_scale(const unsigned long mult, const struct timeval *tv,
- struct timeval *result)
+ struct timeval *result)
{
uint64_t x = ((uint64_t)tv->tv_sec * 1000 * 1000 + tv->tv_usec) * mult;
* \param result Contains (1 / mult) * tv on return.
*/
void tv_divide(const unsigned long divisor, const struct timeval *tv,
- struct timeval *result)
+ struct timeval *result)
{
uint64_t x = ((uint64_t)tv->tv_sec * 1000 * 1000 + tv->tv_usec) / divisor;
tv_scale(chunk_num, chunk_tv, &tmp);
tv_add(&tmp, stream_start, result);
}
+
+/**
+ * Retrieve the time of the realtime clock.
+ *
+ * \param tv Where to store the result.
+ *
+ * Gets the current value of the system-wide real-time clock (identified by id
+ * \p CLOCK_REALTIME). If \a tv is \p NULL, the value is stored in a static
+ * buffer, otherwise it is stored at the location given by \a tv.
+ *
+ * \return This function aborts on errors. On success it returns a pointer to
+ * memory containing the current time.
+ *
+ * \sa clock_gettime(2), gettimeofday(2).
+ */
+struct timeval *clock_get_realtime(struct timeval *tv)
+{
+ static struct timeval user_friendly;
+
+ if (!tv)
+ tv = &user_friendly;
+#ifdef HAVE_CLOCK_GETTIME
+ {
+ struct timespec t;
+ int ret;
+
+ ret = clock_gettime(CLOCK_REALTIME, &t);
+ assert(ret == 0);
+ tv->tv_sec = t.tv_sec;
+ tv->tv_usec = t.tv_nsec / 1000;
+ }
+#else
+ #include <sys/time.h>
+ gettimeofday(tv, NULL);
+#endif /* HAVE_CLOCK_GETTIME */
+ return tv;
+}